Thread: pgsql: Correct StartupSUBTRANS for page wraparound

Correct StartupSUBTRANS for page wraparound

StartupSUBTRANS() incorrectly handled cases near the max pageid in the subtrans
data structure, which in some cases could lead to errors in startup for Hot
Standby.
This patch wraps the pageids correctly, avoiding any such errors.
Identified by exhaustive crash testing by Jeff Janes.

Jeff Janes

Branch
------
REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/6830cae5f862276a52dc8a50edf1d34996539a3c

Modified Files
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src/backend/access/transam/subtrans.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)